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Thomas J O'Brien Lock and Dam, Illinois Thomas J O'Brien Lock and Dam is a dam located in Cook County, IL at N41.65226° W87.56671° (NAD83) and at an elevation of 580 ft MSL. It can be seen on the USGS 1:24K topographic map Lake Calumet, IL.
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Note: Coordinates in the location and feature list above are referenced to NAD83 datum. |